<template>
    <div class="cmt-container">
        <h1>发表评论</h1>
        <hr>
        <textarea  placeholder="请输入要评论的内容（不超过120字）" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in commentlist" :key="item.add_time">
                <div class="cmt-title">
                 第{{i+1}} 楼&nbsp;&nbsp;用户：{{item.user_name}} &nbsp;&nbsp;发表时间：{{item.add_time | dataFormat}}
                </div>
                <div class="cmt-body">
                    {{ item. content === 'undefined' ? '此用户什么都没说':item.content}}
                </div>
            </div>
        </div>
        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from "mint-ui";
export default {
    data(){
        return {
            pageIndex: 1 ,//默认展示第一页数据
            commentlist:[],
            msg: '' //评论输入的内容
        }
    },
    created(){
        this.getcommentlist();
    },
    methods:{
        getcommentlist(){
          this.axios.get('api/getcomments/'+this.id +'?pageindex=' + this.pageIndex)
          .then(result => {
                  if(result.data.status === 0){
                    // this.commentlist = result.data.message
                    //每当获取新评论数据的时候，新评论加在老评论后面
                    this.commentlist = this.commentlist.concat(result.data.message)
                }else{
                    Toast('获取评论失败')
                }
            })
        },
        getMore(){//加载更多数据
            this.pageIndex++;
            this.getcommentlist();
        },
        postComment(){
            //校验是否为空
            if(this.msg.trim().length === 0){
                return Toast("评论内容不能为空")
            }
            //发表评论
            //参数1，请求的url地址，
            //参数2：提交给服务器的数据对象{content：this.msg}
            //参数3：定义提交时候，表单中数据的格式 {emulate JSON：true}
            this.axios.post('api/postcomment/'+this.id,{content:this.msg.trim()})
            .then(result=>{
                if(result.data.status === 0){
                    //1\拼接成一个评论对象
                    var cmt = { user_name: '匿名用户',add_time: Date.now(),content: this.msg.trim()};
                    this.commentlist.unshift(cmt);
                    this.msg = ''
                    }
            })

            
        }
    },
    props:["id"]
}
</script>
<style lang="scss" scoped>
.cmt-container{
    h1{
        font-size: 18px;

    }
    textarea{
        font-size: 14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;

            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
        }
    }
}
</style>